I would wait for the 4 weeks on the Duvel clone, but that's just me. Yes, clarifiers will make the beer clear quicker, but I'm not sure that would benefit the finished beer.
phuzle, why are you going to warm the lager up in the middle of the lagering process? I don't understand that!

If you are lagering the beer, you don't want to change the temps dramatically. Now, if you have already been lagering for a period of time, then just kegging or bottling would be in order. What type beer did you make? and how long have you been lagering it? After the lagering period, I have used clarifiers when I wanted a really clear beer for comps or whatever, but I haven't needed to do that now either, extended lagering has made them absolute clear. Last, pectin isn't what you want, maybe Polycar, which is sold as Divergan F now, or Isinglass, or even gelatin would suffice.